Ilmenite
Ilmenite is an oxide mineral recognized among collectors for its crystal form and distribution, with several world-class Chinese localities.
About Ilmenite
Ilmenite belongs to the oxide class in the ilmenite group and has the chemical formula FeTiO3. It crystallizes in the trigonal system and has a distinctive metallic presence in any collection. Its combination of structural character and global distribution make it a recognized species in both systematic and aesthetic collections.
Identification & care
Ilmenite typically forms thick tabular rhombohedral crystals; massive; lamellar; granular; disseminated. Its color is typically black and iron-black. The luster is metallic, sub-metallic, the streak is black to brownish red, and specimens are typically opaque. The cleavage is none (basal parting on {0001}). The fracture is conchoidal to subconchoidal, which aids identification.
Collector context
How it forms
The geological setting for Ilmenite is typically accessory mineral in igneous rocks (gabbros, anorthosites, basalts); metamorphic; concentrated in beach and river heavy mineral placer sands. It is commonly found in association with magnetite, rutile, hematite, apatite, pyrite, zircon (in placers).
Classic Chinese localities
**Huanggang Fe-Sn deposit** is an important Chinese source for the species.
Why collectors care
Collectors pursue Ilmenite for the clarity of its crystal form and, in good material, saturated color that reads instantly across a display case. A well-terminated ilmenite on clean matrix photographs well, identifies quickly, and anchors a cabinet piece. Top Chinese specimens over the last two decades have reset the bar for what ilmenite looks like at collector grade.
What affects value
Value in Ilmenite is assessed, in typical order of weight, against: (1) locality provenance; (2) size relative to the species norm; (3) crystal form and termination sharpness; (4) color saturation and zoning; (5) transparency and internal clarity; (6) matrix quality and aesthetic balance; (7) condition (absence of damage, chips, or repair). Cleaning quality and verified locality documentation act as multipliers across the above.
Naming history
The name Ilmenite has a specific etymological and historical context — see Mindat's reference entry for provenance details. We have retained naming data at the record level; published prose is paraphrased from factual fields rather than copied from source.